/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * FDS Conversion
 *
 */

#include "mapinc.h"


static DECLFW(Mapper42_write) {
// FCEU_printf("%04x:%04x\n",A,V);
	switch (A & 0xe003) {
	case 0x8000: VROM_BANK8(V); break;
	case 0xe000: mapbyte1[0] = V; ROM_BANK8(0x6000, V & 0xF); break;
	case 0xe001: MIRROR_SET((V >> 3) & 1); break;
	case 0xe002: IRQa = V & 2; if (!IRQa) IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
	}
}

static void FP_FASTAPASS(1) Mapper42IRQ(int a) {
	if (IRQa) {
		IRQCount += a;
		if (IRQCount >= 32768) IRQCount -= 32768;
		if (IRQCount >= 24576)
			X6502_IRQBegin(FCEU_IQEXT);
		else
			X6502_IRQEnd(FCEU_IQEXT);
	}
}

static void Mapper42_StateRestore(int version) {
	ROM_BANK8(0x6000, mapbyte1[0] & 0xF);
}


void Mapper42_init(void) {
	ROM_BANK8(0x6000, 0);
	ROM_BANK32(~0);
	SetWriteHandler(0x6000, 0xffff, Mapper42_write);
	SetReadHandler(0x6000, 0x7fff, CartBR);
	MapStateRestore = Mapper42_StateRestore;
	MapIRQHook = Mapper42IRQ;
}

